in src/main/java/com/twitter/http2/HttpFrameEncoder.java [147:159]
public ByteBuf encodeSettingsFrame(HttpSettingsFrame httpSettingsFrame) {
Set<Integer> ids = httpSettingsFrame.getIds();
int length = ids.size() * 6;
byte flags = httpSettingsFrame.isAck() ? HTTP_FLAG_ACK : 0;
int streamId = 0;
ByteBuf frame = Unpooled.buffer(HTTP_FRAME_HEADER_SIZE + length);
writeFrameHeader(frame, length, HTTP_SETTINGS_FRAME, flags, streamId);
for (int id : ids) {
frame.writeShort(id);
frame.writeInt(httpSettingsFrame.getValue(id));
}
return frame;
}